1972 318 timing

Hi again,

I just changed the intake on my 318 and need to adjust the timing. Based on my memory the factory says 6 to 8 BTDC.

Now the setup is clode to factory but with this:
Stock 318, automatic
Edelbrock Performer intake
Holley 1850 carburator
Headers
Dual 2.5" exhaust

Also, to time the thing I think I reed somewhere that it needs to be:
warm engine
Trans in neutral
Vacuum disconnected from the distributor and plugged at the distributor and carb.

Any advice on the timing? Degrees? How to?

Thanks in advance ... or after :D